(19)
(11) EP 0 426 497 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.03.1992 Bulletin 1992/10

(43) Date of publication A2:
08.05.1991 Bulletin 1991/19

(21) Application number: 90312055.8

(22) Date of filing: 02.11.1990
(51) International Patent Classification (IPC)5: G02B 27/00
(84) Designated Contracting States:
DE FR

(30) Priority: 03.11.1989 GB 8924831

(71) Applicant: GEC-MARCONI LIMITED
Stanmore, Middlesex HA7 4LY (GB)

(72) Inventors:
  • Firth, Kenneth
    Chelmsford, Essex, CM3 4PT (GB)
  • Langdon, Roger Martin
    Colchester, Essex, C04 4PZ (GB)

(74) Representative: Waters, Jeffrey et al
The General Electric Company, p.l.c. GEC Patent Department Waterhouse Lane
Chelmsford, Essex CM1 2QX
Chelmsford, Essex CM1 2QX (GB)


(56) References cited: : 
   
       


    (54) Helmet mounted display


    (57) A holographic objective system (3) produces an intermediate real image (4) of information displayed on an electrically addressable spatial light modulator SLM (1), the real image (4) being collimated by a powered holographic reflector (5) constructed as part of the visor of a helmet worn by the viewer (9). The SLM (1) is illuminated by laser light from a remote laser (8) via a single optical fibre (6) and beam splitter (2). A diffuser (7) is provided either between the laser and the beam splitter or in the plane of the intermediate image (4). The objective system (3) may alternatively include, or consist entirely of, conventional optical elements.







    Search report